US 8,138,980 B2Granted

Antenna device for radio apparatus and portable radio apparatus

AssigneePanasonic Corporation

InventorsDaigo Imano, Mitsuharu Nakasato, Nobuaki Tanaka

Life of this patent

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Abstract

An object of the present invention is to provide an antenna device for a radio apparatus in which the amount of energy (SAR) absorbed by a head of a human body can be reduced without lowering the power of radio waves transmitted during a call. There is provided a board 108 serving as a base plate of an antenna element, an antenna element 102 disposed in a longitudinally end portion of the board 108 through a feeding portion 107, a conductor plate 109 disposed substantially in parallel with a main surface of the board 108 and disposed on the opposite side to a surface having a sound hole of a receiver portion, and a plurality of short-circuit conductors 110 disposed on a lower end portion of the conductor plate 109. The conductor plate 109 is short-circuited to a lower end portion of the board 108 through the short-circuit conductors 110.

Claims3

Dependent claims

An antenna device for a radio apparatus, comprising:

a base plate having;
multiple surfaces, one of the multiple surfaces being a main surface, the main surface having the largest surface area among the multiple surfaces of the base plate;
an antenna element disposed on a first end portion of the main surface of the base plate, the antenna element connected to the first end portion of the base plate through a feeding portion;
a conductor plate disposed outwardly of the base plate in a width direction of the main surface of the base plate, the conductor plate having multiple surfaces, one of the multiple surfaces of the conductor plate being a conductor plate main surface, the conductor plate main surface having the largest surface area of the multiple surfaces of the conductor plate and being perpendicular to the main surface of the base plate;
and
a short-circuit conductor connected to a second end portion of the base plate, the second end portion being opposite the first end portion of the base plate;
wherein the conductor plate is short-circuited to the second end portion of the main surface of the base plate through the short-circuit conductor.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/885,293Filed 17 Sep 2010 · division
Priority: JP 2004-28158628 Sep 2004
Published: US 2011/0043416 A124 Feb 2011
Granted: 20 Mar 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H01Q 1/52
Details of, or arrangements associated with, antennas: means for reducing coupling between antennas; Means for reducing coupling between an…
H01Q 1/245
Specially adapted for hand-held use: with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
H04B 1/3838
Hand-held transceivers: arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
H04M 1/0202
Constructional features of telephone sets: portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets

Family

PCT/JP2005/017815Parent of this division · filed 28 Sep 2005
US 2011/0043416 A1Pre-grant publication · published 24 Feb 2011
Application11/570,129Parent of this division
US 7,859,467 B2Parent of this division
US 2008/0266188 A1Published application
US 8,138,980 B2This patent

From the US filing history. Foreign family members aren’t listed.